If on a given day the speed of sound increases by 5% between 8:00am and 11:00am, and if the temperature at 8:00am was 21oC, what was the temperature at 11:00am?
A. 21.6oC
B. 21.3oC
C. 25.4oC
D. 29.8oC
D. 29.8oC
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A deuteron is captured by an oxygen-16 atom which in turn emits a proton. What is the element and mass number of the product isotope?
a. oxygen-15 c. nitrogen-15 b. fluorine-15 d. oxygen-17
A solar mass star will evolve off the main sequence when:
A) it completely runs out of hydrogen. B) it expels a planetary nebula to cool off and release radiation. C) it explodes as a violent nova. D) it builds up a core of inert helium. E) it loses all its neutrinos, so fusion must cease.
In a self-sustaining fusion reaction, such as occurs in the sun,
A) energy is destroyed. B) nuclear energy is created from other forms of energy. C) energy is created. D) thermal energy is converted to nuclear energy. E) nuclear energy is converted to other forms of energy.
If Earth's axis had no tilt, would we still have seasons? Why or why not?
What will be an ideal response?